Dunkirk H2OST Stainless Steel Storage Tanks - Manual (Page 6)

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3. Additional recommended components
A. Shut-off valves. Allows the isolation of the water heater from the boiler system during service.
B. Unions. Allows for easy locating or removal.
C. Vacuum breaker. Protects the water heater from collapse if a hot tank is valved off to service other components in
the system.
D. Thermal expansion tank. If the water heater is installed in a closed water supply system, such as a system having
a back flow preventer in the cold water supply line, the installation of a thermal expansion tank is required.
4. Water Quality
Improper water quality will reduce the expected life of the water heater. Hard water, sediment, high or low Ph, and high
levels of chlorides in the domestic water should be avoided. Sediment and hard water will eventually coat the heating coil
inside the water heater and reduce the rate of hot water production and may, eventually cause a failure. High or low Ph
and/or high chloride concentrations will cause corrosion and eventually failure. A filter is strongly recommended where
sediment is present in the water. A water softening system is recommended for areas with hard water.
In an area where the water quality is not known, a water quality test should be performed.
WARNING:
Do not operate water heaters in areas where the Ph is above 8.0 or below 6.0, and/or with chloride concentrations greater
than 100 parts per million (ppm). ECR’s standard warranty does not cover problems caused by improper water Ph or
excessive levels of chlorides.
5. Piping
A. Drain the domestic water system.
Shut off the cold water supply at the main shutoff valve.
Open one or more faucets to relieve the pressure. Open the system drain, leaving the faucets open.
B. Position the water heater in the final location.
C. Connect the cold water supply piping.
Install piping onto cold inlet connection. Connect to cold water supply connection using a union, a heat trap, a
shut-off valve, an expansion tank (where required), a back flow preventer (where required).
D. Connect the domestic hot water piping.
Install piping onto hot water supply connection using a union, a heat trap, a vacuum breaker, and a shut-off
valve.
E. Pipe the relief valve discharge so that the discharge from the valve will exit only within 6 inches above, or at any
distance below, the structural floor, and cannot contact any live electrical part. The discharge opening must not be
blocked or reduced in size under any circumstances. Refer to local codes.
F. Fill the water heater tank.
Open all faucets to allow air to purge from the tank and piping. Remove screens on faucets.
Open domestic hot water shut-off valve.
Open cold water inlet shut-off valve.
Purge all of the air from the domestic water system. Allow water to run so the tank is completely purged of any debris.
Run the water long enough to change at least five tank volume changes. Close all faucets. Reinstall all of the screens in
the faucets.
Check the system for leaks. Repair as required.